Comparing to 280 Linux intercom system, Dnake 150 system provides most of the functions such as video intercom, door access, emergency call, and security alarm, etc. The indoor monitor 150M-S4 can also connect to IP phone or SIP softphone. 

Dnake SIP-based Android video door phone system is designed to provide an integrated security solution. Android video phone system enables you to open the door by facial recognition with liveness detection and gives you the combined benefit of security and convenience. With 4.3'' TFT LCD display, this  SIP-based call station also supports communication with IP phone or SIP softphone, etc.  It can be applied in apartment buildings.

150M-S3 is a 10'' Linux indoor monitor which offers brilliant visual display and touchscreen experience.  It is frequently considered to put in large residential areas. 

Dnake 150 Linux video door phone system contains most functions of 280 Linux intercom system, such as video intercom, door access, emergency call, and security alarm, etc. The indoor monitor 150M-S2 can also communicate with IP phone or SIP softphone via SIP protocol. 

Dnake indoor monitor 280M-I8 is used in high-rises, building complexes, and large residential areas. It supports video intercom, door access, emergency call, security alarm, home automation and elevator control, etc.